New Prius Battery Kit (GEN2, 2004-2009)

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New Prius Battery Kit (GEN2, 2004-2009)

The next shipment is expected around May 15th 2021


What is this?

This is a DIY kit to completely and fully replace your aging or dead Toyota Prius Hybrid Battery (a.k.a. Traction Battery) with brand new battery modules, bus-bars, battery wiring harness, and interconnects. You retain your original metal enclosure and hybrid ECU.

Will this work with my Vehicle?

This is meant for Generation-2 Toyota Prius vehicles, model years 2004 through 2009. We also have kits available for Generation-1 (2001-2003) and Generation-3 (2010-2015) available with request. These modules will work in any number of Toyota and other makes that use the same Panasonic battery design, but the wiring kit is specific to the Prius. With extra (and non-supported) DIY, you could potentially make it work with many more vehicles.
Brand New Batteries: Not a refurb or rebuild. These are brand new modules fresh out of the factory and have never been in a vehicle. ZERO miles driven.
Superior Design: Cylindrical cells, half the battery modules, and all the same functionality. Upgrade your Hybrid Pack today!
Factory Warranty: A 2 year or 25,000 mile warranty on the modules. Fleet vehicles included.

How Much?

For $1600 and 4 hours of installation time, you will get a brand new hybrid battery backed by a 2-year or 25,000 mile warranty including fleet vehicles. There is nothing comparable out there. All other options that are not original Toyota Hybrid packs, are used modules. Some are refurbished and/or balanced to be better matched with one another, but they are still all used batteries from wrecked, salvaged, totalled, or other failed Prius vehicles. In contrast these batteries from are brand new and never used. When you start driving on your new pack, it starts with zero miles on it, just like a brand new Prius from the factory.

The Smarter Financial Investment

Don't waste your money on refurbished or remanufactured batteries. The only real solution to repair your Toyota Prius Hybrid Battery is to replace the entire pack. Anything else is a temporary band-aid, akin to playing the game whack-a-mole. Why spend the same money to put in used modules inside a refurbished pack instead of buying new modules from us? Our batteries at are the smartest choice for any Toyota Prius needing a Hybrid Battery pack replacement.


The Hybrid Battery is different than an original Toyota Hybrid Battery, but it is made to be interchangeable. The largest differences and features are highlighted below
Half the Modules: An original Toyota pack uses 28 modules paired into 14 blocks. We've simplified the design and now you just need 14 larger modules making the same 14 blocks
Fully Compatible: Designed to be 100% backwards compatible with the original modules. Uses the same wire connectors, same mounting, same temperature sensors, same enclosure.
Factory Warranty: A 2 year or 25,000 mile warranty on the modules
Cylindrical Cells: These cells are shaped like a series of large D-Cell batteries instead of the rectangular bricks of the original.
New Bus Bars: The kit comes complete with new solid metal bus-bars to connect adjacent modules together, new nuts, and new wiring.
No Core Charge: When you order, you get your battery pack kit. There is no extra charge for a core, and no deposit required. Your old parts can be saved or sold to offset the cost.
Standard Installation Flow

These kits are no more difficult to install than a standard battery swap. In fact, it is recommended to follow one of the many YouTube videos of how to disassemble your 2004-2009 Toyota Prius [Contact Us for Gen1 (2001-2003) and Gen3 kits (2010-2015)] to access the Hybrid Battery and to put it back together.

Disassemble Prius to Access Hybrid Battery
This involves removing the false floor, some interior plastic panels, and disconnecting the rear seats. All can be done with a socket wrench and a screw-driver. A power-drill is recommended with a socket attachment to make life easier. Average time for a first-time disassemble is roughly 1 hour. An experienced rebuilder can usually do this within 5-10 minutes.
Remove Hybrid Battery from Vehicle
This is a heavy part, it is best to have help. You will need to access the bottom of the pack, so it does need to be fully removed. It cannot be worked on in the car.
Disassemble Original Hybrid Battery
Remove the cover, remove the battery nuts, remove the bus bars, disconnect the venting, disconnect the temperature sensors, remove the tension bar, and end up with the shell of a battery. Since there is no core charge, you are welcome to keep your old modules or to sell them on eBay for others venturing to make refurbished used packs to help offset the cost of your brand new pack! Remember if you ever intend to extract a core exchange fee, you will need your original modules at this time.
Assemble Brand New Hybrid Traction Pack
Line up your modules in serial order. Each of the 14 modules is marked from #1 through #14, and put them in order. Attach the bus-bars, battery nuts, and new wiring harness. Move battery to original enclosure. Attach temperature sensors via included clips. Attach modules from the bottom to the original battery enclosure. Complete the wiring, and put the cover back on the battery. That's it! Average time for a first install is about 1 hour if you are taking your time.
Re-Install Hybrid Battery in Vehicle
Again, this is a heavy part and it is best to have help. Carefully place the newly assembled battery back into the Prius.
Reassemble the Prius
Now it is time to put all the bolts, screws, and plastic panels that make up the rear of Prius back together. This may take an hour for a first time builder, again 5-10 minutes for an experienced installer.
Complete Install
Make sure to latch the orange safety interconnect back in-place (it can be tricky!) and READY the vehicle. If you have codes, it is best to clear them before driving. Your brand new battery is now installed and should be trouble free and worry free for a very long time. You also have the peace of mind that your brand new battery from is fully warranted for 2 years or 25,000 miles, whichever comes first. In the unlikely event of a warranty replacement, we will send you a new battery module for you to install.
Included in the Kit

The Prius Battery Kit requires some installation. If you are not comfortable working with high voltage DC, any hybrid battery installer local to your area should be able to provide the service for you, and the installer may contact us with any questions.
14 Cylindrical Battery Modules: The life-blood of your Hybrid Battery Pack.
Bus-Bars and Nuts: Solid metal bus-bars and nuts to connect the battery modules together and to the enclosure.
Wiring Harness: A new wiring harness to connect to each of the 14 modules, the safety interconnect, and the HV ECU.
Mounting Screws: To secure the battery modules to the original Toyota metal enclosure.
Battery Module Spacers: Orange High Voltage plastic spacers to secure the battery modules.
Battery Module Covers: Orange High Voltage plastic covers to limit exposed high voltage connections.
Temperature Sensor Mounts: Three plastic clips that secure the original temperature sensors to the new battery modules
Customer Support Email: If you have questions before, during, or after your installation feel free to contact us.

2 year or 40,000km/25,000mi warranty. Modules are warranted for block voltage error codes. Installation, labour, and shipping are not included in the warranty. Warranty is serviced by battery factory with as the intermediary.

48 Reviews Hide Reviews Show Reviews

  • 5
    Don't play module whack-a-mole. If your time is valuable, get this kit.

    Posted by Jeremy Bender on Oct 15th 2020

    I don't get to say this often, but my experience with buying this battery completely exceeded all of my expectations. When the battery pack on my wife's Gen2 Prius failed in July this pack was out of stock and not likely to be delivered before we needed to get the car inspected (in July), so we decided to go with the battery whack-a-mole process and replace failed modules and rebalance the pack. Two months later it failed again, so we broke down and ordered this kit, which had an estimated ship date of early November. We were shocked when it shipped in early October (nearly a month early). It arrived extremely well packed, the instructions were clear, and I had the whole installation done in less than four hours. The car is now running like new, with much improved mileage and drivability. I'll definitely be back to purchase a kit for my Gen3 when it needs a battery replacement.

  • 5
    New gen2 Prius hybrid battery pack

    Posted by Sean on Oct 10th 2020

    If you are considering replacing your dead or dying pack, do not buy a refurbished one. Buy new. These guys at New Prius Batteries know what they are doing and my new pack is running awesome. My car is running better than it has in years. The new pack is everything they say it is. The install was fairly easy. Although you will need to follow instructions and take it one step at a time. And during the install, Nick answered my questions so quickly so I was able to get it installed. Basically for $1600 I didn't have to replace my 2007 Prius. Nick and his team are the best.

  • 4
    GEN 2 Prius Battery Installation.

    Posted by Brian Boyarko on Aug 11th 2020

    Never having done this job before, it took me about 5 hours to install the batteries in the frame carrier, and another 3 hours to to the R & R in the vehicle.

    The documentation seemed to imply that the batteries would mount into the pack as they were packaged in the box, with the #1 pack closest to the MCU; however, it soon became apparent this was impossible without turning the units upside down, and reversing the ends. This left the numbering and on the individual modules on the bottom of the module, and no longer visible unless the module is removed.

    Then the secondary wiring harness had number from what the documentation said were a GEN 3 unit, and mine was a GEN2. Then the email that should have clarified this discrepancy further confounded it by saying the GEN3 numbering system was being changed back to the GEN2 system? Whatever, it was fairly obvious where the wires needed to go, so I put them there.

    Finally, the connection to the pack that goes to the high voltage disconnect is pretty ugly, and impossible to get installed that doesn't put a preloaded physical stress on the wiring. This should have replacement cables supplied as a part of the kit.

    It would be reasonable to think this kit will not have the durability of a factory battery, which should be expected at half the cost. So I plan on babying it by avoiding all high discharge current activities ( heavy acceleration up hill, air conditioning on when stopped, etc.)

    But it seems to work so far, and it is not difficult to install. A good sanity check is to measure the series voltages of the pack as you install each module..

  • 5

    Posted by William Humble on Jul 9th 2020

    I've been driving the car for several weeks, a thousand miles maybe, and it runs beautifully. 55 miles per gallon city and highway. Better than when my son bought 55,000 miles ago. Follow the directions and watch several Youtube videos and if the car is in decent condition otherwise you will be very pleased with this product.

  • 5
    NEW PRIUS BATTERY KIT (GEN2, 2004-2009)

    Posted by Jon Garbisch on Jun 15th 2020

    I am very impressed with the overall product. At 474,000 miles our 2004 Prius finally indicated the Triangle of Death... while on the interstate at 75 mph. The Prius still functioned well enough to continue and park at home some 150 miles further along. We had been considering a new battery for the past year as there where other indications. Our new battery kit was easy to order, and arrived weeks before the estimated time given. The price is very competitive or well under most other options. The instructions are detailed and while there are some inconsistencies in what is included and what is left out there was nothing critical to properly installing the new batteries. Small issues were easy to resolve by reading ahead or reviewing previous sections. The design of the battery modules really limits potential mistakes as well. The kit and instructions are not perfect but close enough to merit 5 stars. An experienced mechanic can easily do the entire project in well under a day; first time through the procedure. What remains to know is can we get another 500,000 miles out of this battery? Given the company pitch it should outperform the OEM Panasonic/Toyota battery as installed; ask me in 15 years. My only concern in the overall design is in the major changes to the cooling airflow pattern inside the Toyota battery case. Without added vanes to direct air flow will the batteries on the far side from the cooling ducts see adequate cooling? If you guys have done testing with 2 (an upper and a lower) temp sensors on each module under real world use to confirm even cooling of the assembly I would be much happier to recommend this design to others. Those tests should be posted on your website; and would have locked in my purchase much earlier. The OEM design baffles the airflow between each module; though the larger spacing of the New-Prius Battery design might allow significantly more overall air flow. Right now it is a big unknown but I like the design enough to risk those issues. My career experience as an early VW mechanic (air cooled engines) supports great care in design in this area. Flow is often not going where you think it should in air-cooled designs with out proper ducting and careful placement of vanes. But there are design I've seen that work well enough for the need with very little effort made to direct flow; so all might be fine in this case. Ask me in 15 years.

    Overall a great product and so far I am very happy with the purchase. Jon G

  • 5
    Much easier than having to balance the modules

    Posted by Jared on Feb 27th 2020

    I have owned my 05 prius for 10 years (210,000 miles) and have had to replace and rebalance the modules 4 times over the course of owning it. Sure replacing a few modules is quite a bit cheaper but it's also a total
    pain in the ass and usually takes me 1 - 2 weeks. Plus the modules are always used and I am lucky if I get 10K miles before the next issue. This time I decided to go with the new batteries. No balancing needed. Just swap everything out and it works. Instructions were simple to follow. I have put 5k miles on the car since the install and everything has been running great. (Still gets 48mpg) If you have the money and want better piece of mind, go with these batteries.

  • 5
    New vs Remanufactured

    Posted by James A. Maddox on Nov 5th 2019

    New batteries make so much more sense than used or rejuvenated used packs. The failure rates on used packs is too high for our hybrid shop to consider anymore. Once we found "New Prius" that is all we are recommending for our customers. The replacement is pretty straight forward however; the instructions are pretty detailed. Only the experienced technician with many rebuilds can perform this task in under 5 hrs. Read the instructions carefully and completely.
    This is a Great product with a significant advantage over the other options.
    Jim's Automotive Inc.

  • 5
    These are dynamite!

    Posted by Aubi on Oct 8th 2019

    Thanks for engineering these new cells. I installed the new cells a month ago and my 2006 Prius with 185,000 miles has been feeling healthy. I've been replacing and rebalancing the Panasonic modules since 2014. They would last for 1-2 years and I was saving money but spending a lot of time doing it. The design of these new cells are user-friendly and makes reassembling the pack straightforward and fairly foolproof. I don't think people have to be too scared to try this on their own. You're doing quite a service to make these available. Thank you!

  • 5
    Prius Gen 2

    Posted by David on Oct 2nd 2019

    This is amazing! The package was shipped in a very timely manner. And the items are very well packaged and secured. Following the detailed instructions that was sent via email are simple and well illustrated. It took a whole day for me to replace as I took my time. But overall, this is a great alternative than buying a brand new from the dealership. It’s been a day since I installed the batteries and so far so good. The car feels peppier and no more warning lights. I am glad to get my Prius back to running condition.